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7 Series - E65 / E66 (2002 - 2008)
Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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  #1  
Old 07-27-2008, 08:42 PM
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Discussion regarding "MOST bus fault patterns" sticky thread

Edit:
Quote:
Originally Posted by M.Wong
Please see sticky post at the top of the E65/66 section for the reference material.

LINK: http://bimmerfest.com/forums/showthread.php?t=300965

Discussion that followed is below.
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Last edited by M.Wong; 12-30-2008 at 05:46 PM. Reason: Clean up
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  #2  
Old 07-28-2008, 01:00 AM
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bmwtech, thank you for the post! it is quite informative, and with my IT background, I understoof all of it quite easily... M. Wong I highly suggest this article be made a sticky, as it is very informative and I can see many people referring to this post for info....

Once again, the tech saves the day... someone needs to post that batman pic =)
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  #3  
Old 07-30-2008, 07:27 AM
mike_atkinson mike_atkinson is offline
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Thanks for that write up, very interesting!
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  #4  
Old 12-27-2008, 08:01 AM
mkabat mkabat is offline
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Thanks, I have problems with sound quality and it usually starts producing some strange noise after few minutes. I tried to "reset" it by unplugging the cable in the glove box, and sound was really better for about 10 minutes. Now it is back again. Will try to go to service.. ( sorry for simple English, I am from Europe )
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  #5  
Old 12-27-2008, 09:36 AM
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Def should be sticky, M. wong can you please?
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  #6  
Old 12-29-2008, 04:22 AM
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Thanks BMW_Tech for this very very helpful information.

Quote:
Sustained noises in the CD Changer
---The MOST ring is permanently interrupted. Ring break or MOST bus diagnosis should be carried out.

Brief audio failures
A) When the failure occurs followed by a magazine check from the CD changer and the sound returns......
MOST likely cause :
Stationary vehicle: CD changer or Power Module disconnection.
My car always does something similar, but I am not too sure if it is the same case.
the CD changer is always disconnected and reloading itself when I first start the car in the morning when it's parked over night. But then it work perfectly fine if I dont leave the car off more than say around 8 hrs. In this case, is it the same cause? How should I address my problem with the dealer because last time we looked into this issue, they just cannot reproduce it in the short time. I hope you can give me some insight in pointing them the right direction. Thanks for your time and efforts.
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Old 12-29-2008, 09:57 PM
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Quote:
Originally Posted by andynolife View Post
Thanks BMW_Tech for this very very helpful information.


My car always does something similar, but I am not too sure if it is the same case.
the CD changer is always disconnected and reloading itself when I first start the car in the morning when it's parked over night. But then it work perfectly fine if I dont leave the car off more than say around 8 hrs. In this case, is it the same cause? How should I address my problem with the dealer because last time we looked into this issue, they just cannot reproduce it in the short time. I hope you can give me some insight in pointing them the right direction. Thanks for your time and efforts.
I suspect a parasitic draw. They just didn't want to deal with monitoring the draw. Ask to see the diagnosis report printout. See which bus MOST/CAN resets, see what module reports the MOST amount of reset or bus fault. Im pretty sure if you don't drive it for 2-3 days, you will get the battery warning or power module disconnection.
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  #8  
Old 12-29-2008, 09:58 PM
mbz1 mbz1 is offline
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my car is doing the same as yours, i am working to get it fixed will post when i find somthing out


Rob.
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  #9  
Old 12-29-2008, 10:49 PM
745ByMySide 745ByMySide is offline
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My car stays in the garage for weeks at a time and I never have any of these problems (knock on wood)
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Old 12-30-2008, 05:31 AM
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Quote:
Originally Posted by BMW_tech View Post
I suspect a parasitic draw. They just didn't want to deal with monitoring the draw. Ask to see the diagnosis report printout. See which bus MOST/CAN resets, see what module reports the MOST amount of reset or bus fault. Im pretty sure if you don't drive it for 2-3 days, you will get the battery warning or power module disconnection.
Thanks for the input Tech
but I haven't driven the car for the past 7 days due to the crazy heavy snow, worst in 10 years for Vancouver. Yesterday i started the car and there was no warning or fault code what so ever, the car was in perfect condition. Again, the CD changer was disconnected and reloading itself as the car is unlocked as usual. Does it just have a mind of its own?
and I highly doubt I can reproduce the issue in the next dealership visit
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  #11  
Old 12-30-2008, 07:20 AM
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Quote:
Originally Posted by 745ByMySide View Post
My car stays in the garage for weeks at a time and I never have any of these problems (knock on wood)
I tend to get less fault codes and stuff when my car sits for a couple days also. It just seems to have less problems when I let it sit for 2 days or so. Most of the time the steering wheel doesn't reset to the preset position, but when I let it sit for the weekend, it does.
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  #12  
Old 12-30-2008, 07:31 AM
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Quote:
Originally Posted by andynolife View Post
Thanks for the input Tech
but I haven't driven the car for the past 7 days due to the crazy heavy snow, worst in 10 years for Vancouver. Yesterday i started the car and there was no warning or fault code what so ever, the car was in perfect condition. Again, the CD changer was disconnected and reloading itself as the car is unlocked as usual. Does it just have a mind of its own?
and I highly doubt I can reproduce the issue in the next dealership visit
That has to be easy to reproduce. Allow the vehicle to assume sleep mode. The next time you come in for service, speak to the shop foreman. Let him know that you will be coming around during your lunch break, if that's possible. Do not allow any dealer personnel to even move the car so ask the foreman to hang on to your key and repair order until you come around. I am guessing that since the CDC "resets", it does not remember the last CD and track when you turned off the ignition. There has to be a MOST bus fault, ask the foreman nicely to see what faults are stored. Let him know that your main concern is that you don't end up with a dead battery if there is a parasitic draw. You want to save yourself the "you don't drive the car often" speech that you've heard from other owners. And you do not want to wait until the other MOST bus modules become affected or show symptoms of BUS communication error or "reset". It's either CAN or MOST. But CAN will affect other audio sources such as PRESET/STORED stations. You do not want to experience a MOST haunting, screeching and speakers cutting in and out belongs in a haunted house.....NOT in your LOGIC seven. Look in while it sits in the garage every now and then, make sure that it remains asleep. Look at the "push to start" button and the seat switch and make sure that the backlighting isn't lit. Do not pull the outer door handle OR touch it if you have comfort access. You just want to make sure your baby is asleep. Remember that the TCU wakes up if you have BMW Assist. It may wake up the MOST since the CDC memory could not be retained. My apologies for the lengthy reply.
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  #13  
Old 12-30-2008, 07:40 AM
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Wow How funny (well not funny) This morning im listening to my radio and my audio got really low, but i can still hear it. It sounded like only the woofers where on. I Turned off the car and turned back on, still sounded low. I waited 15 min with the car off then turned it back on the audio volume was back to normal. 3 minutes later audio got really low again.
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  #14  
Old 12-30-2008, 07:42 AM
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Quote:
Originally Posted by mcfalcons15 View Post
I tend to get less fault codes and stuff when my car sits for a couple days also. It just seems to have less problems when I let it sit for 2 days or so. Most of the time the steering wheel doesn't reset to the preset position, but when I let it sit for the weekend, it does.
Let me do some research. I remember reading something about this problem. I believe it's a SW issue. I have to dig through SIB's and PuMA cases. Bear with me. Check to see if your ODOMETER resets itself to zero or check to see if it remembers your KEY specific personalization. Use the other key for confirmation, you know what I am trying to get at. Also check and pay attention to your clock, make sure you don't lose minutes or any symptom like it. That's worse case scenario, it's when you shouldn't "let it slide" or ignore. That's how I "roll", never worry as long as Im around.
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  #15  
Old 12-30-2008, 12:07 PM
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Quote:
Originally Posted by andynolife View Post
I highly doubt I can reproduce the issue in the next dealership visit
my dealer was able to replicate the problem when i took it in for the same problem... however, they kept doing band aid fixes and not checking up on their work, hoping i would just leave them alone or not care... so, i did what i had to... i video taped the phenomenon showing the car unlocking and the cdc shifting through all 6 discs, and starting from disc 1 track 1... i also showed in the video how nothing was installed in any external power element... i showed this to the service manager when i dropped it off and let them know that i wasn't playing around any more... thats when they replaced my power module and fixed it, after the 4th or 5th attempt!
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  #16  
Old 01-17-2013, 05:32 AM
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Hi guys can anyone tell me were my Antenna module is! Ive done ring test and I'm informed that I have break between my Antenna Tuner and Voice Control System.
Thanks
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  #17  
Old 07-26-2014, 03:10 PM
Waziri Bello Waziri Bello is offline
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My e65 notified me on batery recharge a number of times but never failed to start. Finally at some point I couldn't access the idrive display and there was a bit of lag when I increase or decrease the air conditioning fan before it responds, So I changed my batery but didn't register it until 2 days later. After registering the batery all sorts came up;
1. Transmission fail safe mode.
2. Dynamic driving fault
3. Brake/drive fault
4. Salvotronic fault

Lastly my gear selection seems to be stuck on one gear three without shifting. Even the gear display on the dashboard didn't show which gear was incumbent. Also my speedometer and rpm stopped, but the last time I checked the speedometer and rpm were all back on the dashboard. My technician couldn't guess what exactly was wrong. Please guys I need to know please.


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  #18  
Old 05-16-2016, 07:41 AM
Jayson Wonder Jayson Wonder is offline
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Very helpful post. I am wondering if you have any knowledge that could help me with my MOST system problem.

I replaced a water damaged Micro Power Module and since them I have a "Head Unit Not Correctly Programmed" error. I tried reprograming to defaults using NCS but no luck. I get an MOST system BUS interrupted error from DIS but after taking out each component of my audio system and checking for fiber optic signal it appears that is passing the red light. So I have to believe it is still the lack of correct programming of the "Head Unit", thus preventing proper communication with other modules and the reason I have no sound, door chimes, etc. I am not sure if the Air bag, Seatbelt, Restraint system lights / errors are at all related...

Any idea how to properly reprogram a car after replacing the MPM so I can regain functionality of the audio system.

Thanks for your time!
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Old 08-05-2016, 04:41 PM
will911 will911 is offline
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Hi All, this is my first post here, so please bare with me.

Recently purchased an 7 Series E66 2008. Am very pleased with it, however now i'm having quite a few issues with it and have struggled to pinpoint the solution so far.

-The iDrive freezes occasionally
-The Navi screen is black
-No FM/AM/DAB/TV/DVD stations are listed
-Cannot alter any settings or check cars performance

So far i have test each module in the back of the car using a fiber loop to close the circuit (hoping to find that a fault module was causing the issue), however to date no modules in the boot whilst using the loop have solved the problem.

I have unplugged the negative connection from the battery and reconnected it, i can see that each module is getting power as they have a red light, however at the same time the cd player in the front of the car makes whirring noises and eventually stops making noises, after this point there are no more red lights on any of the fibre cables in the back. I can also confirm that before the cd player stop whirring, in the glove box there is a red light on the fibre cable which i on a loop - so i thought that this meant there is no MOST bus problems?

Also, there is no sound from the car, it doesn't make noises for anything, like low fuel etc.

I also have the seatbelt light on the dash permanently and of recent have the airbag light on also, no messages on idrive screen though. I have checked connections under drivers and passengers seat and all appears ok.

I'm thinking that the ask unit may be knackered, could anyone shed any light on it? Is there a way i can isolate the ask unit to check?
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  #20  
Old 08-24-2016, 01:02 PM
colmroughan colmroughan is offline
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Hi, did you have any luck getting this resolved? I have an 07 E66 and it's been having the exact same issues. i'm bringing it to the dealer on Friday for a service and will see if they can trace the fault. The Navigation DVD appears to be the problem as it's no longer powering on but when disconnected it it didn't have any effect.





Quote:
Originally Posted by will911 View Post
Hi All, this is my first post here, so please bare with me.

Recently purchased an 7 Series E66 2008. Am very pleased with it, however now i'm having quite a few issues with it and have struggled to pinpoint the solution so far.

-The iDrive freezes occasionally
-The Navi screen is black
-No FM/AM/DAB/TV/DVD stations are listed
-Cannot alter any settings or check cars performance

So far i have test each module in the back of the car using a fiber loop to close the circuit (hoping to find that a fault module was causing the issue), however to date no modules in the boot whilst using the loop have solved the problem.

I have unplugged the negative connection from the battery and reconnected it, i can see that each module is getting power as they have a red light, however at the same time the cd player in the front of the car makes whirring noises and eventually stops making noises, after this point there are no more red lights on any of the fibre cables in the back. I can also confirm that before the cd player stop whirring, in the glove box there is a red light on the fibre cable which i on a loop - so i thought that this meant there is no MOST bus problems?

Also, there is no sound from the car, it doesn't make noises for anything, like low fuel etc.

I also have the seatbelt light on the dash permanently and of recent have the airbag light on also, no messages on idrive screen though. I have checked connections under drivers and passengers seat and all appears ok.

I'm thinking that the ask unit may be knackered, could anyone shed any light on it? Is there a way i can isolate the ask unit to check?
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  #21  
Old 08-25-2016, 07:13 AM
will911 will911 is offline
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Hi colmroughan,

I did get this fixed.

Firstly, just unplugging the unit will not solve the problem. The modules all run on a fiber network, so if you disconnect one of the modules then they all go down!

What you need is a fiber loop, i got mine from here -- http://www.ebay.co.uk/itm/Fiber-MOST...-/252346854031

You will need to cut away some of the plastic housing, but it will be come clear when you try to offer it up to the network in the car. This loop will bypass the possibly faulty unit and continue sending the signal along the way. If everything else works once you try this, then you know the unit you bypassed with the loop needs replacing.

I had a faulty AM/FM transmitter, which is not situated in the boot of the car. Mine is behind a panel behind the back passenger seat. All you need is a screwdriver to remove the airbag sign and screw, then everything else pulls off.

Give it a try!
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Old 09-06-2016, 12:50 PM
colmroughan colmroughan is offline
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Hi, thanks for your help - sorry for not replying sooner but I only just got the fiber loop shipped to me. You were right, I had to cut away a good amount of the plastic housing but when I offered it to the connector nothing happened so I think I might have more than one faulty module. i'll keep working through the modules and see what happens. Thanks again!
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  #23  
Old 09-06-2016, 01:16 PM
will911 will911 is offline
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Yes keep trying. I also found that I had to physically move the modules as some of the connections were hard to get at. You will also probably have to try the ASK unit in the front. For that you may need trim removal tools, really cheap on Amazon. Once the trim is off though, the unit is easy to pull out and test. Let me know how you get on.
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